Model comparison

GPT-4o-mini vs GPT-5.1 Codex Mini

Compare GPT-4o-mini (OpenAI) and GPT-5.1 Codex Mini (OpenAI) by price, context, capabilities, and latency.

Which should you pick?

Price: GPT-4o-mini is cheaper ($0.15 / 1M tokens input / $0.6 / 1M tokens output) vs GPT-5.1 Codex Mini ($0.25 / 1M tokens input / $2 / 1M tokens output).
Context: GPT-5.1 Codex Mini has the larger context window (400k tokens).

Side by side

GPT-4o-mini vs GPT-5.1 Codex Mini — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

Model	Provider	Input	Output	Context	Capabilities	Best for	Latency	Status	Source
GPT-4o-miniopenai/gpt-4o-mini	OpenAI	$0.15 / 1M tokens	$0.6 / 1M tokens	128k	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1003-2082ms	Catalog	Platform curated
GPT-5.1 Codex Miniopenai/gpt-5.1-codex-mini	OpenAI	$0.25 / 1M tokens	$2 / 1M tokens	400k	StreamingTool callingJSON modeVision	image understanding, multimodal chat	1836-5647ms	Catalog	Platform curated

FAQ

GPT-4o-mini vs GPT-5.1 Codex Mini FAQ

Is GPT-4o-mini or GPT-5.1 Codex Mini cheaper?

GPT-4o-mini is cheaper ($0.15 / 1M tokens input / $0.6 / 1M tokens output) vs GPT-5.1 Codex Mini ($0.25 / 1M tokens input / $2 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, GPT-4o-mini or GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini is larger (400k tokens) vs 128k tokens.

GPT-4o-mini vs GPT-5.1 Codex Mini for Vision: which should I pick?

Both target Vision. Pick GPT-4o-mini to optimize cost, or GPT-5.1 Codex Mini for the longer context window. Test both on real prompts before committing production traffic.

GPT-4o-mini details GPT-5.1 Codex Mini details Pricing calculator OpenAI-compatible quickstart